The Yo wire generally refers to the double loop wire, also known as the YO coil assembly (from the English "Wire-O-Binding") and the O coil assembly. The double coils are two strand steel coils which are preset in size and specifications. The common materials are divided into two types: sprayed steel rings and plastic coils. Usually the circular or square holes are printed on the left or upper side of the printed material. After the YO double coil passes through the YO ring, the binding machine is pressed and fixed, and the binding procedure is completed.
After the coil is locked, no more pages can be added unless the coil is removed. The double coil binding cost is higher than the single coil, of course, the binding effect is better and more durable. Using double coils to bind a picture album, when reading, you can completely flatten any page, which is very convenient for reading and inquiring. Books that are less than 30mm within thickness, such as tool books, technical manuals, recipes, recipes, VIS manuals and architectural atlas, are most suitable for this binding method.
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